The pyrazole derivative or its salt in a pharmaceutical composition containing them

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PROBLEM TO BE SOLVED : To provide a novel compound and a pharmaceutical composition useful for treatment and/or prevention of HIV virus infections.SOLUTION : Provided is a pyrazole derivative represented by the general formula (I) or a salt thereof (in the formula, Ris a Calkyl group, Ccycloalkyl group, a phenyl or naphthyl group which may have a substituent; Ris a hydrogen atom, a Calkyl group, or a phenyl group; Ris a hydrogen atom, a cyano group, or a Calkoxycarbonyl group; Rand Rare each independently a hydrogen atom, a halogen atom, a Calkyl group, or a Cacylamino group, a Calkylaminocarbonyl group, or a phenyl group or an indazolyl group which may have a Calkoxy group; and Xis *-CH=CH-**, *-CH-NH-**, *-NH-CH-**, or *-N=N-**), and a pharmaceutical composition containing the same.